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All Journal Indonesian Journal of Geography Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Infinity Tadris: Jurnal keguruan dan Ilmu Tarbiyah Progresiva : Jurnal Pemikiran dan Pendidikan Islam Jurnal Optimasi Sistem Industri JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Forum Geografi Jurnal Penelitian dan Pembelajaran IPA Indonesian Journal of Science and Technology Journal of Natural Sciences and Mathematics Research Al-Jabar : Jurnal Pendidikan Matematika JIPF (Jurnal Ilmu Pendidikan Fisika) PRISMA Journal of Islamic Architecture Desimal: Jurnal Matematika Jurnal Pertahanan : Media Informasi tentang Kajian dan Strategi Pertahanan yang Mengedepankan Identity, Nasionalism dan Integrity JTAM (Jurnal Teori dan Aplikasi Matematika) International Journal of Supply Chain Management Navigation Physics : Journal of Physics Education Andalasian International Journal of Agricultural and Natural Sciences International Journal of Electronics and Communications Systems International Journal of Hydrological and Environmental for Sustainability Journal of Advanced Sciences and Mathematics Education Online Learning in Educational Research Islamic Journal of Integrated Science Education JIPI (Jurnal IPA dan Pembelajaran IPA) Jurnal Infinity
Rofiqul Umam
School Of Science And Technology, Kwansei Gakuin University, Japan
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Optimization and Interpretation of Heat Distribution in Sterilization Room Using Convection Pipe Abdurrahman, Abdurrahman; Umam, Rofiqul; Irzaman, Irzaman; Palupi, Endah Kinarya; Saregar, Antomi; Syazali, Muhamad; Junaidi, Rahmad; Wahyudianto, Benny; Adi, Langit Cahya
Indonesian Journal of Science and Technology Vol 4, No 2 (2019): IJOST: VOLUME 4, ISSUE 2, 2019
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v4i2.18177

Abstract

In mushroom cultivation of white oyster mushroom (P. ostreatus), problems in the contamination during the production are typically found. This contamination is due to the issue in controlling temperature during the media sterilization for growing the fungus (bag-log). This suboptimal sterilization causes unwanted bacteria and spores to grow. To reduce the amount of contamination, the purpose of this study was to demonstrate and evaluate the temperature distribution using one convection pipe with diameter of 6 and 8 cm. The fuel used for this sterilization process is rice husk. Sterilization itself aims to kill other unwanted bacteria and spores on the bag-log. Sterilization was done by traditional steaming bag-log drums arranged in four rows upwards for 6 hours. Convection pipes were built in drums. The steamer was done by performing two retrievals of data. From the experiment results, the use of convection pipe of 8 cm was better than the convection pipe of 6 cm. This is shown from the amount of fungal contamination in convection pipes were less in 8. The result of temperature measurement using dual laser infrared thermometer was also completed and interpreted using Matrix Laboratory with interpolation method to get heat distribution result.
Utilization of Stem Bark and Leaves of Kluwih (Artocarpus Altilis Park) as an Anti-Mosquito Repellent: A Case Study of Total Mosquito Mortality (Anopheles Sp) Kurniawan, Betta; Puspita, Laila; Kurnia, Yogi; Husna, Ismalia; Rahmat, Ali; Umam, Rofiqul; Andriana, Bibin B.; Jermsittiparsert, Kittisak
Indonesian Journal of Science and Technology Vol 5, No 3 (2020): IJOST: VOLUME 5, ISSUE 3, 2020
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v5i3.25370

Abstract

The purpose of this study was to demonstrate an alternative solution as an insecticide from Indonesian natural ingredients. We investigated the potential use of Artocarpus altilis park (known as kluwih plants in Indonesia) for an anti-mosquito repellent because it contains flavonoids and saponins. The use of this type of insecticide is harmless, inexpensive, and largely available in Indonesia. In the experiment, we extracted bark and leaves of kluwih to obtain insecticidal material to repel Anopheles sp. To ensure the precise extraction and insecticidial effect, the experiments were conducted four times with three repetitions. For each experiment, we used 8.4 mL with the concentrations of 20, 30, and 40% of flavonoid. The results showed that the higher the concentrations of bark and leaf extracts of Artocarpus altilis park the higher the mortality rate of Anopheles sp is.
Identification of Slip Surfaces Using the Geoelectric Imaging Method in the Kalirejo Area, Kokap District, Yogyakarta, Indonesia Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
JIPF (Jurnal Ilmu Pendidikan Fisika) Vol 6, No 3 (2021): September 2021
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jipf.v6i3.2072

Abstract

Landslides are a significant threat to the environment, infrastructure, and human activity, especially in mountainous and hilly areas. It is, therefore, important to accurately identify the social movements that trigger these processes. The resistivity method can investigate subsurface geological variations, including the potential for landslides. This research was conducted to investigate the subsurface structures in the Kalirejo Village area, Kokap District, Kulon Progo Regency, Yogyakarta regarding identifying the sliding location. This investigation includes five lines of tomographic geoelectric measurements. The results show that the slips surface is at a depth of about 5-10 m with a high resistivity value and the landslide material is weathered soil, and the slip surface is andesite. The resistivity of andesite in range 668-1600 Ωm. The landslide material's thickness is around 5-8 m with resistivity in the range 4,01-22.1 Ωm. Landslide material is water-saturated soil.
3D Modeling of Subsurface Lawanopo Fault In Southeast Sulawesi, Indonesia Using Grablox and its Consequence to Geohazard Triani Triani; Rofiqul Umam; Sismanto Sismanto
Indonesian Journal of Geography Vol 53, No 1 (2021): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.50878

Abstract

Lawanopo Fault is a horizontal shear fault (sinistral strike-slip) found in Southeast Sulawesi province and is thought to be active during Plio-Pleistocene or mid-late Miocene to the present. This study has been carried out which aims to find out the geometric shapes below the surface of the Lawanopo fault using complete Bouguer anomaly (ABL) data.  The ABL data is projected onto a flat plane using the Dampney method at an altitude of 8 km, and the separation of local and regional anomalies is carried out using the upward continuation method at an altitude of 60 km. Three-dimensional (3D) modeling under the surface of the Lawanopo fault is done using the computer program Grablox. Data processing techniques using Singular Value Decomposition (SVD) and Occam inversion. The results showed that a high gravity anomaly of 190-225 mGal was caused by an igneous rock below the surface with a density of 2.7-3.33 gr/cm3 and a thickness of about 13 km, a moderate anomaly of 175-187 mGal caused by Paleozoic igneous rocks aged Carbon with a density of 2.6-2.9 gr/cm3 and a thickness of about 25 km. Low anomaly 115-160 mGal is caused by rocks with a density of 2.0-2.5 gr/cm3 and a thickness of about 22-23 km. The Lawanopo fault constituent rocks consist of alkaline rocks in the basement covered by sediment and metamorphic with a depth of Lawanopo fault more than 15 km and begin to be seen at a depth of 4.3 km of the surface. it is known that the area around the Lawanopo fault is an area prone to earthquakes. But, based on the soil and rock structure around the Lawanopo fault, the compactness and attenuation levels in reducing earthquake waves are quite good, so that land use around the Lawanopo fault tends to be safe.
Identification of Andesite Resource Potential In Kalirejo Area, Kokap Sub-District, Kulon Progo Using Resistivity Method Rizqi Prastowo; Hurien Helmi; Obrin Trianda; Rofiqul Umam
Forum Geografi Vol 35, No 1 (2021): July 2021
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/forgeo.v35i1.13507

Abstract

In the last five years, the need for materials to build infrastructure in Kulon Progo Regency has increased with the construction of an international airport. In the construction process, strong earth or rock materials are needed to make buildings resistant to earthquakes, one of which is andesite rock. This study aims to determine andesite rocks' resources using a three-dimensional model based on the value of resistivity in Kalirejo district Kokap Kulon Progo. The research was conducted by geological and geophysical survey. Based on data on the distribution of rocks in the research area included in the intermediate igneous rocks, andesite. These rocks are intrusions that develop in research areas. Petrography analysis is used to determine the types of minerals in andesite rocks and determine which levels of rock changes have changed or not to affect the strength of rocks. These rocks are intrusions that develop in research areas. Geophysical survey is by resistivity method using configuration dipole-dipole with five lines, and each stretch is 200 m. Based on three-dimensional model resistivity, fresh andesite is at a depth of between 5-10 m. Value of andesite resistivity is more than 668 Ωm, while the value of weathered andesite resistivity ranges from 256-536 Ωm and andesite resources about 332,580 tons.
Search, Solve, Create, and Share (SSCS) Learning Model: The Impact on the Students Creative Problem-Solving Ability on the Concept of Substance Pressure Rahma Diani; Hesti Herliantari; Irwandani Irwandani; Antomi Saregar; Rofiqul Umam
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 9 No. 1 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n1.p65-77

Abstract

This study aimed to determine the effectiveness of the Search, Solve, Create, and Share (SSCS) learning model and its impact on the students creative problem-solving ability. The study was conducted on eighth-grade students of Junior High School 24 (SMPN 24) Bandar Lampung, Indonesia, on the Substances Pressure subject matter. This is quasi-experimental with non-equivalent control group design. The independent sample t-test showed that the SSCS model influences the students creative problem-solving ability, of which the experimental class is higher than the control class. Furthermore, the results of the effect size obtained the d value of 2.39, indicating the SSCS learning model is effective for the students' creative problem-solving ability which belongs to the high category.
The Characteristics of the First Kind of Chebyshev Polynomials and its Relationship to the Ordinary Polynomials Ikhsan Maulidi; Bonno Andri Wibowo; Vina Apriliani; Rofiqul Umam
JTAM (Jurnal Teori dan Aplikasi Matematika) Vol 5, No 2 (2021): October
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jtam.v5i2.4647

Abstract

In this article, we discuss the Chebyshev Polynomial and its characteristics. The second order difference equation and the process obtaining the explicit solution of the Chebyshev polynomial have been given for each real number. The symmetry and orthogonality of the Chebyshev polynomial has also been demonstrated using the explicit solutions obtained. Furthermore, we have also given how to approx the polynomial function using the Chebyshev polynomials.
LEARNING MODEL TO IMPROVE THE ABILITY TO UNDERSTAND MATHEMATICAL CONCEPTS Syamsul Huda; Lusi Anggraini; Rizka Dwi Saputri; Muhamad Syazali; Rofiqul Umam
PRISMA Vol 8, No 2 (2019): Jurnal PRISMA Volume 8, No 2 tahun 2019
Publisher : Universitas Suryakancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35194/jp.v8i2.769

Abstract

Teaching and learning process to determine student learning outcomes requires the selection of appropriate learning models so that it can provide maximum learning impact. This study aims to determine the effectiveness of better learning models for the ability to understand mathematical concepts. This type of research is quantitative using the Quasi-experimental design method. Data collection in this study uses a description test with the type of questions based on indicators of mathematical concept understanding ability. Hypothesis testing uses a non-correlated 2-sample t test with decisions taken through the left-side test. This shows that the Flipped Classroom learning model is more effective than the Auditory Intellectually Repetition learning model in influencing students' mathematical concepts
Islamic Education in Supply Chain System by Prioritizing Manners as a Success Factor of Millennial Generation on Socializing Syamsul Huda; Muawanah Muawanah; Munifah Munifah; Muhamad Syazali; Endah Kinarya Palupi; Rofiqul Umam; Hasan Said Tortop
International Journal of Supply Chain Management Vol 9, No 2 (2020): International Journal of Supply Chain Management (IJSCM)
Publisher : International Journal of Supply Chain Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (807.268 KB)

Abstract

Abstract-The progress of Science, Technology, Engineering and Mathematics (STEM) in the Era of the Industrial Revolution 4.0 requires that learning systems in schools must be developed by considering the supply chain. Since June 2006 the Tebuireng Islamic Boarding School has been developing an education system based on the supply chain strategy. In this development, the Tebuireng Islamic Boarding School begins with a religious-based education or theology that prioritizes manners in supply chain. In this case, we analyzed learning success factors based on Law Auguste Comte as the objective in this study. The study aimed to investigate the relationship between anticipation ability, supply chain, ability to accommodate and integration of education system with the mediation effect of self-organizing skills. In addition, a collaboration of 3 countries was also carried out to seek integration of schools in developed countries such as Japan and Turkey as a reinforcing factor for the success of the education system for the millennial generation in socializing. The results of the study provide very strong information and compatibility in the success of student learning, attitudes, and behavior as a millennial generation in the Industrial Revolution Era 4.0. The most dominant success factor in learning success based on the results of school integration in Japan, Turkey, and the TebuirengPesantren is the respect for others based on the formation of good characters, such as tolerance, respect, polite in speaking, and polite in acting. Besides, learning models such as Innovative learning are the most suitable models in the Industrial Revolution Era 4.0, because at this time almost all learning is based on the Internet of Things (IoT) as a very good learning media.KemajuanScience, Technology, Engineering and Mathematics (STEM) pada Era RevolusiIndustri 4.0.
ROBUST DECISION MAKING (RDM) INVESTIGATION IN WATER RESOURCES PLANNING AND DISASTER MITIGATION IN MAKASSAR CITY, INDONESIA Zakir Sabara; Rahmad Junaidi; Rofiqul Umam
Jurnal Pertahanan: Media Informasi ttg Kajian & Strategi Pertahanan yang Mengedepankan Identity, Nasionalism & Integrity Vol 6, No 3 (2020)
Publisher : The Republic of Indonesia Defense University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33172/jp.v6i3.932

Abstract

The Kota Makassar water utility serving (Perusahaan Daerah Air Minum - PDAM) faces a significant problem in managing water resources for their drinking water supply. The problems comprise raw water supply, the vulnerability of water quality, infrastructures, costs, and climate change uncertainty. The availability of clean water is one of the problems in the field of national defense. Because water is the main source of life in all sectors, be it agriculture or livestock. This study is aimed at assisting officials in making an adaptive and resilient decision. It involves inter-and cross-disciplinary studies within Robust Decision-Making (RDM) in water resources management planning for drinking water supply and disaster mitigation in Makassar. This research applies a qualitative approach in data analysis; reviewing strategies used by the utility management to anticipate all uncertainty, long-term strategies feasibility from simulation models, analyzing potential vulnerability scenarios, and the trade-off for an adaptive and robust decision in water resources management planning for drinking water supply in Makassar through RDM. The novelty lies in the raw water management policy that is more adaptive toward potential vulnerability and presents a variety of raw water supply alternatives in the long term. Reviews against the document of drinking water Master Plan found that the absence of harmony along with a high level of anticipation towards the threat of climate change along with their impact, as well as the threat of the raw water supply limitations due to the exogenous problems beyond the reach of human beings capacity, will result in global and long-term impact.
Co-Authors Abd. Rasyid Syamsuri Abdul Mutolib Abdurahman Abdurrahman Adi, Langit Cahya Adytama, Alhamdy Afiah, Irma Nur Ahmad Said Al-Hijrah, Al-Hijrah Ali Rahmat Andika Eko Prasetiyo Andika Eko Prasetiyo, Andika Eko Andiyan Andriana, Bibin B. Anggraini, Atika Annisa Nurhuda Romadhona Antomi Saregar Ardian Asyhari Aziza Anggi Maiyanti Bayu A. Sadjab Belista Gunawan Betta Kurniawan, Betta Bonno Andri Wibowo Bumi, Philosofi Setia Cengiz, Korhan Dewa, Parama Kartika Dewa, Parama Kartika Dewi Lengkana Dixit, Aparna Endah Kinarya Palupi Endah Kinarya Palupi Endah Kinarya Palupi Endah Kinarya Palupi Felga Zulfia Rasdiana Fitria Lestari Fitria Lestari Fredi Ganda Putra Fujiani, Dwi Haerul Anwar Handayani, Tri Wahyu Harnomo, Fajar Ikhwan Hartati, Niken Sri Hartono Hartono Hasan Said Tortop Hasan Said Tortop Hasan Said Tortop Hesti Herliantari Hirotaka Takahashi Hurien Helmi Husna, Ismalia I Putu Tedy Indrayana Ikah N. P. Permanasari Ikhsan Maulidi Ilma Ridhona Imama, Khoirunnisa Iqbal, Mochamad Iresha, Fajri Mulya Irma Nur Afiah Irwandani Irwandani Irzaman, Irzaman Iskandar Tsani Iskandar Tsani, Iskandar Iwamony, Steven Jermsittiparsert, Kittisak Kasam Kasam, Kasam Khoirunnisa Imama Khusnul Yakin Kittisak Jermsittiparsert Kurnia, Yogi Laila Puspita Laili, Ummiy Fauziyah Lengkana, Dewi Lusi Anggraini Mada Sanjaya WS Maharani, Fareza Chandri Michalska-Domańska, Marta Mochamad Iqbal Muawanah Muawanah Muhamad Syazali Muhamad Yasin Muhammad Nafian Muliadi Ramli Munifah Munifah Munifah Munifah, Munifah Muniroh, Luthfiyatul Nanda Ridki Permana Nangkula Utaberta Nurhanurawati Nurhanurawati Nurhanurawati Nurhanurawati Palupi, Endah Kinarya Panse, Vishal R puspitarum, deska lismawenning Rahma Diani Rahma Diani, Rahma Rahmad Junaidi, Rahmad Rahmi Ramadhani Rashidi Abdull Manap, Mohd Riana, Ulfa Ridhona, Ilma Ridwanulloh, M. Ubaidillah Rika Rahmawati Rika Rahmawati Rizka Dwi Saputri Rizqi Prastowo Rohim, Miftahul Romadhona, Annisa Nurhuda Saiful*, Saiful Santi Widyawati Saxena, Arti Siregar, Rahmat Nawi Sismanto Sismanto Steven Iwamony Sugeng Sutiarso Sugeng Sutiarso Sumarni, Tita Cardiah Suparman Suparman Suparman Suparman Syamsul Huda Syamsul Huda Tortop, Hasan Said Triani Triani Vina Apriliani Wahyudianto, Benny Wirani, Ayu Puspa Yakin, Khusnul Yasin, Muhamad Yetri Hasan Yudha Satya Perkasa Yudha Satya Perkasa, Yudha Satya Zakir Sabara